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Abstract

Processing of IC chips through an inspection workstation requires transfer of individual chips from one type of carrier to another or to a test station. Depending on the result of testing, the chip is then routed to an appropriate carrier for retest or subsequent processing. A means was required to ensure that any combination of the different types of carriers used with the workstation are positioned and oriented accurately so the chip-handling mechanism can locate the reliably. The Chip Carrier Fixture Assemblies met these requirements.

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United States

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English (United States)

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Chip Carrier Fixture Assemblies

Processing of IC chips through an inspection workstation requires transfer of
individual chips from one type of carrier to another or to a test station.
Depending on the result of testing, the chip is then routed to an appropriate
carrier for retest or subsequent processing. A means was required to ensure that
any combination of the different types of carriers used with the workstation are
positioned and oriented accurately so the chip-handling mechanism can locate
the reliably. The Chip Carrier Fixture Assemblies met these requirements.

Disclosed is a set of fixtures designed to mount onto the X-Y stage of the
workstation and provide accommodations for mounting various combinations of
the chip carriers used for input and output of chips through the workstation.

As shown in Figs. 1, 2, and 3, the base for all of the fixtures is a 10 X 13-inch
precision machined base plate 1 which is positioned on the Y-X stage 3 by two
dowel pins 2 and held in place by four machine screws. These pins and th sets
of pins provided to position the chip carriers establish datum lines on the X and Y
axes. From these known reference positions, the host workstation controller can
determine the locations of individual chips in a carrier using a software lookup
table for the current product and carrier.

Reflow boats, used as input carriers in all current applications, are located on
the right in all three Figs. A spacer 4 elevates these carriers to bring the chips to
the same height as those in other carriers, thus eliminating the need for a costly
variable height servo-Z head and permitt...